How did you know that your Elegance Coral was sick? I have a greenish one that has 5 separate fleshing parts all in a row. Today one seems missing, bit I can't tell if it's just retracted or moved. They look more crammed together than usual. Then there are these brown bubbles where the missing one used to be... Is that the same thing as what happened with yours?

Ok so i just realized there are two different posters on this thread. Wael - your looks to have brown jelly disease. Try to remove any of the brown slime from the coral and keep good flow over that area. Thats about all i can tell you besides fragging off the infected area which can be difficult with elegance corals. Others may be able to suggest a better way to treat it but i have not hear of one.

Scotty- can you get some water readings? How long has the coral been in the tank? Also are there any other fish in the tank with it?